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Date:	Thu, 23 Feb 2012 15:59:44 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	Tejun Heo <tj@...nel.org>, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Lennart Poettering <lennart@...ttering.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFD] cgroup: about multiple hierarchies

> Trying to make all the controllers uniform in terms of their treatment
> of cgroup hiearchy sounds like a good thing to do.

Agreed.

Apart from nesting cgroups, there're other inconsistencies.

- Some controllers disallow more than one cgroup layer. That's the new
net_prio controller, and I don't know why it's made so, but I guess
it's fine to eliminate this restriction.

- Some controllers move resource charges when a task is moved to
a different cgroup, but some don't?

- Some controllers disallow task attaching under some circumstances.
So if we have a single hierarchy with all subsystems, the chance
that attaching a task to a cgroup fails may be bigger.

> Once that is done,
> one can probably see if it is worth to put all the controllers in a
> single hierarchy.
> 
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